Jan Järfalk


User experienced esthete, technician, geek and web worker. Aspiring recreational mathematician. I splurge, indulge and travel plenty. Food eater and cocktail drinker. Constraints are good.

Multistable Perception

Multistable perception is the spontaneous alternation between two or more perceptual states that occurs when sensory information is ambiguous


In this hypocycloid the inner circles has half the radie of the outer which make the dot orbiting in a straight line.


In geometry, a hypercube is an n-dimensional analogue of a square (n = 2) and a cube (n = 3). It is a closed, compact, convex figure whose 1-skeleton consists of groups of opposite parallel line segments aligned in each of the space’s dimensions, perpendicular to each other and of the same length.