There is a version of practice that happens in gyms and studios and dedicated spaces, with good lighting and smooth floors, where everything is optimized for the work.
And there is a version that happens in a field, with the balls landing in the grass when you drop them, and you picking them up and trying again.
Both kinds of practice build the skill. The second kind builds something extra.
What informal practice teaches
A practice session in a field is not a degraded version of a studio session. It is a different kind of session with different properties.
The grass is uneven. The lighting changes. The balls disappear when they land and have to be found. None of these are problems to solve. They are conditions to work within - which means the practice includes adapting, not just executing.
This is the difference between practicing a pattern in ideal conditions and practicing a pattern in real conditions. Real conditions include ground that is not flat, light that shifts, distractions that arrive without warning. A skill practiced only under ideal conditions is not fully practiced.
What recovery time actually is
Most of a practice session is not the pattern running. It is the props at rest, the practitioner recovering, the next attempt not yet begun.
Practice is mostly preparation and recovery punctuated by brief moments of the pattern running. The pickup between attempts is the part that actually builds the skill.
The pattern running is what people photograph and what people remember about juggling. The pickup between attempts is what builds the skill. Draganski et al. (2004) measured grey-matter changes in novices who learned a three-ball cascade over three months. The change tracked total practice exposure, not the percentage of attempts that ran cleanly. Drops are part of the dose.
Understanding this changes how to read beginner sessions that feel like more dropping than juggling. They are not failed sessions. They are exactly what practice looks like at the beginning.
The visual contrast as a useful instruction
Neon balls in green grass is a high-contrast image. The colors are designed to be visible in low-light conditions, which means in daylight against natural backgrounds they are very easy to find.
This is a practical choice that most jugglers who practice outdoors make: use props that are easy to recover quickly after a drop. The faster you can pick up what you dropped, the more throws you can make in the same amount of time. Reducing recovery time increases the density of useful practice.
The same logic applies to technical learning environments. The faster the feedback loop - the shorter the time between writing code and seeing the result - the more practice cycles you can fit into a session. Short feedback loops are not just more pleasant. They are more productive because they increase the density of the learn-adjust cycle.
The field is always available
A studio has to be booked. A field is wherever there is grass and some space.
Ordinary grass, ordinary light, no preparation. Props and space are the full set of conditions required. Everything else is preference.
Read next: Practice Follows You - what happens when the practice shows up on a boat.