I recently noticed that most types of drums are placed horizontally, left to right, from high to low pitch. Take for example the bongo and the conga drums. The higher pitched one is with both on the left while the lower one is on the right. Or with a normal drum set. The snare is left and moving to the right, each drum gets lower pitched. With pianos and marimbas and most other instruments it's reversed, the low pitched notes are left while the high ones are right. Why is this? Whenever during playing in my band I transfer from my marimba to for example the bongo or conga, it often confuses me and then I just turn the bongo around so the low one is left and the high one is right like I'm used to with instruments.
Please note that I'm not particularly interested in the placement of a drum set but rather drums over all, so take for example the bongo or conga. There it's just two or three drums which are placed from high to low.