Remember that drums are two dimensional, but circular, so there is at least one more thing in their response: the timbre if the sound is affected by the radial

Remember that drums are two dimensional, but circular, so there is at least one more thing in their response: the timbre if the sound is affected by the radial location of the hit, which encourages different harmonics and hence a different sound. You can also hit parts other than the drumhead - and the rim and head (nearly) simultaneously.